By this logic we should ban peanut products altogether because a lot more people (comparatively speaking, it's still less than 2% of the population) are allergic to peanuts.
Peanut products are avoidable. A fungus-based plastic substitute that replaced any meaningful fraction of common plastic products would be ubiquitous.
Yes, and I'm pretty sure there's a reason you don't hear about people trying to make biodegradable packaging out of peanut shells. As noted, people can be exposed to packaging of a product even if they have no intention of using the product, so packaging needs to be made out of safe materials.
You can eat and make a soup out of anything, even stones and hatchets. Survival isn't always guaranteed tho
Strictly speaking, it does matter: if it's a single-use item, it should biodegrade instead of just piling up. And grocery bags don't actually need to be single use, for that matter.
Think about the plastic grocery bag from the perspective of its inventors. That is, from the point of view of an engineer in the '60s or early '70s who's only vaguely aware that environmentalism is even a thing.
